For Outlook 2010
To begin setting up your Comcast email account in Outlook 2010, start Outlook. Go to the File tab, click on Account Settings and select Account Settings from the drop down. Go to the Email tab of the Account Settings dialog and click New. Select Email Account and click Next. Select the Manually Configure Settings or Additional Server Types check box. Click Next.
Select the Internet Email radio button and click Next. The next screen is the Internet E-mail Settings (POP3) page, on which you must complete multiple fields. Type your name as you want it to appear to message recipients in the Your Name field. Type your complete email address, including the @comcast.net suffix into the Email Address field. Type your Comcast user name, which is the prefix of your email address before @comcast.net into the User Name field and enter your Comcast email account password into the Password field. Type mail.comcast.net in the Incoming mail server (POP3) field and smtp.comcast.net in the Outgoing mail server (SMTP) field.
Click the More Settings button and go to the Outgoing Server tab. Select the My Outgoing Server (SMTP) Requires Authentication check box and make sure Use Same Settings as My Incoming Mail Server is selected as well.
Go to the Advanced tab and enter 110 in the Incoming Server (POP3) field. Ensure that the This Server Requires an Encrypted Connection (SSL) is not selected. Enter 587 in the Outgoing Server (SMTP) field. Change Use The Following Type of Encrypted Connection to None. Click OK.
Click the Test Account Settings button. If there are any errors, go back and make sure you filled all of the fields correctly. Otherwise, click Next and then click Finish to complete the setup.